Datacc, a platform for researchers in physics and chemistry: spotlight on negative results. An interview with Marie-Emilia Herbet and Jérémie Léonard • As leading centers for chemistry and physics, the libraries of Lyon-1 and Grenoble-Alpes University have joined forces to develop Datacc, a platform supported by CollEx-Persée. Datacc is specifically designed as a support service for researchers in physics and chemistry. Marie-Emilia Herbet and Jérémie Léonard, with participation from Lucie Albaret, present the project and its latest developments, centered around handling negative results.